Chemistry
Fill in the blanks with the appropriate words for each of the statements given below:
Germination of seeds is considered a …………… [physical/chemical] change.
If a change is permanent and irreversible, it is considered a …………… [chemical/physical] change.
Heating a piece of iron is considered a …………… [physical/chemical] change, while heating a piece of coal [carbon] is considered a …………… [physical/chemical] change.
Chemical changes may involve exchange of energy in the form of …………… & …………… [light/sound/magnetic /heat].
Change of milk to curd is a …………… [desirable/undesirable] change.
Phy & Chem Changes
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Answer
Germination of seeds is considered a chemical change.
If a change is permanent and irreversible, it is considered a chemical change.
Heating a piece of iron is considered a physical change, while heating a piece of coal [carbon] is considered a chemical change.
Chemical changes may involve exchange of energy in the form of heat & light.
Change of milk to curd is a desirable change.
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Related Questions
Give reasons why - separation of mixtures e.g., iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Explain in brief the involvement of energy in - physical & chemical changes.
State whether the following statements are true or false. If false, write- the correct statement.
Desirable changes are meaningful, while undesirable changes are unfavorable.
During physical changes, the composition of the original substance is not altered, but the properties of the original substance are altered.
During a chemical change the composition of the original substance is not altered, and the change is irreversible.
Melting of butter and wax are examples of chemical changes.
The melting of ice is an exothermic, irreversible chemical change.
Match the examples of changes in List I with the correct type in List II.
List I List II 1. Expansion of a steel rod on heating A. Physical 2. Rotting of eggs B. Chemical 3. Milk turning sour 4. Tarnishing of copper 5. Separation of naphthalene from a mixture of naphthalene & sodium chloride